Dolly-bar.



No. 720,723. PATENTBD PBB.17,-19o3.

- w. A. MILLER. Y

' DOLL-Y BAR. APPLIS IIIIIIII 111) JJJJJJJJ 02.'

"WMI

IMM/ZW? Ww, ma

UNITED STATES 'PATENT' OFFICE;

l/VILLIAM A. MILLER, OF WEST NEWTON, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO WILLIAM MAXWELL, OF PITTSBURG', PENNSYLVANIA.

DoLLY-BAVR.'

SPECIFICATION forming part of Letters Patent N0, 720,723, dated February 17, 1903. Applicatinniiled July 3, 1902. Serial No. 114,207. (No model.)

To rif/Zi whom, t 'may concern:

Be it known that I, WILLIAM A. MILLER, a

citizen oi' the United States off America, re-

siding at West Newton, in the county of WVestmoreland and State of Pennsylvania, have in- A still further object of my invention is ton provide a dolly-bar extremely simple in construction, highlyefcient in operatiomstrong,

durable, and comparatively inexpensive to manufacture, and one wherein I provide means for taking up the strain and concussion upon the person using the same, which heretofore has been a great disadvantage to the person using the dolly-bar.

To put my invention into practice, I provide a dolly-bar wherein I use a spiralA spring to resist the concussion caused by the heading of the rivet, and I also provide means whereby diierent-sized heads may be placed within the dolly-bar.

With the above and other objects in view the invention consists in the novel construction, combination, and arrangement of parts to be hereinafter more fully described, and specifically pointed out in the claims.

In describing the invention'in detail reference is had to the accompanying drawing, forming a part of this specification, and where- 'in like numerals of vreference indicate like parts throughout the view, which represents a vertical section of my improved dolly-bar.

In the drawing the reference-numeral 1 represents a cylindrical casing having its forward end screw-threaded, as indicated at 2, and upon said screw-threads I secure a cap 3, said cap having a central aperture 4. The base of the cylindrical casing carries a screwthreaded aperture 5, through which passes a stem 5, said stem being partially screw-threaded, as indicated at '7, the lower end of said stem carrying a handle 8. The upper end of .said stem engages in an aperture 9, formed in a head 10, said head being slidably mounted within the cylindrical casing.

The reference-numeral 11 indicates a spiral spring which surrounds the stem 6, said spiral spring having its forward end resting beneath .the head lO, while the lower end of said spring rests upon the base of the cylindrical casing, as indicated at 12.v

The upper face oi' the head 10 carries a squareiaperture 14.-, and in said aperture is mounted the removable die 15, in the forward end of which is a recess 16. This removable die passes through the aperture e of the cap 2.

The operation of my improved dolly-bar is as follows: Heretofore considerable inconvenience has been experienced by the work- Yman in usingthese dolly-bars, for the reason that all the strain and concussion from the blow upon the rivet was transferred directly to the shoulder of the workman, and in using my improved dolly-bar it is the object of the invention to overcome these difficulties. The workman having placed the die upon the rivet-head and the handle against his body,

lthe rivet may be headed and the concussion vfrom the blow will be relieved and partly taken up by the spiral spring. In providing the screw-threaded cap I allow means for vplacing a number of diderent-sized dies for use in heading the rivet, any number of dies being employed for this use. This movement of the head1() maybe limited at will by means of the screw 7 on the stem. Upon the head in the cylindrical casin g being depressed, the stem will movein the aperture formed in the under side of the head and the spring will be depressed, thus Vrelieving the strain and the force of the blow against the workman.

While I have shown the most practical embodiment of my invention, I wish it to be undei-stood that various changes may be made in the details of construction without departing from the general spirit and scope ofv my invention.

Having fully described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a dolly-bar, the combination of a casing having an exterior screw-threaded end, a sliding head arranged within said casing having formed therein a central aperture, a screw-threaded stem secured in said casing extending into said aperture, a spiral spring encircling said ste-m within the casing, a handle formed upon the end of the stem, a screwthreaded cap inclosing the end of said casing, and a removable die arranged in said head extending through said cap, substantially as described.

2. In a device of the character described, the combination of a cylindrical casing, a spring-pressed head arranged within said casing, said head being formed with a longiwithin said casing and resting upon said' spring, and means for limiting the movement of said head, substantially as described.

In testimony whereof I affix my signature in the presence of two witnesses.

WILLIAM A. MILLER. Witnesses:

JOHN NOLAND, E. E. POTTER. 

